Nut-lock.



N. 886,787. PATENTED MAY 5, 1908.

R. H. FISHER.

NUT LOGKx APPLIOATION PILBD DEO. 11, 1908.

UNITED srAfi:

I RALPH H. FISHER, OF PITTSBURG. PESYLVANIA.

NUT-LOCK.

specification of Letters Patent.

. :Pzttezited May 5, lece.

Application filed December 11, 1906. Serial No. '3.497,285.

T o all whom 'it 'ma-'y co'nccrn:

` Be it known that I, RaLPi-r H. FISHER., a citizen of the United States.of America, residing at Pittsburg, in the county of :illegheny andState ot Pennsylvania, have invented certain new and usefullmprovenients in Nut-Locks, of which the following is a specification,reference being had therein to the accompanying drawing.

This invention relates to certain 'new and useful improvernents in nutlocks, and the invention has for its object the provision of novel meansfor positively holding a nut upon the end of a bolt.

Another object of this invention is to provide a simple and inexpensivenut lock which will be' strong and durable and requir'ing no skillwhatever to manipula'te.

Briefiy described, niy iniproved nut lock consists of providing thethreaded end of a boltI witha contracted end having threads the feverseof the threads upon the end of the bolt. The ordinary nut which is usedin connection with the b'olt has its outer face notched or grooved andin connection with this nut, I use a split washer having its ends bentto forni lugs. One of said lugs adapted to fit in the notch or grooveabove referred to, while the other of said lugs is adapted `to fit in apotched or groo'ved nut' niounted upon the contracted end of the bolt.

The detail construction of niy improved nutlockwill be presentlydescribed and then specifically pointed out in the appended o aim.

Referring to the drawing forrnng part of this specification, likenuinerals of reference designate corresponding parts throughoutA theseveral views, in which 2- Figure 1 is a side elevation of my improvednut lock, partly broken away, Fig. 2-is a fi'on't elevation of a washerused in connection with the nut lock, Fig. 3 is an edge view of thesame, Fig. 4 and 5 are elevations of nuts constit-uting my improved'nutlock.

In the drawings, 1 designate's a bolt, 2 the head thereof, the shank ofthe bolt being provided with a t-hreaded portion 3, and a re- Li, the

duced 'outer end having threads threads 4 being the reverse of thevthreads 3, that is, the threads 3 being right handed and the'thl'eads 4left handed or viceversa. ln the present showing, the threads 3 areshown right-hand'ed, and the threads e left-handed, and'on the threads 3is mounted a mainnut 5 having a'notch or groove 6 in its outer face.,

On the threads 4 is mounted a folloWer-nut 10 provided on its inner facewith diametrically opposedtnotches or grooves 11, one wall of which isbeveled as at 12-, see Fig.'5, the opposing wall being abrupt andextendmg in 'a'direction corresponding to the axis i of the nut, andthis nut is also provided on' its inner face with an annular` recess 14to receive the annular shoulder formed on the bolt by reducing the outerend of said bolt.

n connection with the two 'nuts above described, i employ a splitwasher7, the end's. of which are separated some -distance'from eachother, and which washer is in the nature of a flat faced ring having atone end a lug 7I projecting at right angles to the faces of the washer,and at the other end alug'9 also projecting at right angles to the facesof the .washer, but inI opposite direct-ion to the lug 7'. rfhe lug 7'lies in substantially the same plane as the body of the washer, itsouter end extending slightly beyond the face of the washer, the letterbeing beveled on'the inner face as shownat 7a in Fig. 3, and the sameface of the washer at the other end thereof ist beveled as at 8 in Fig.3, and this said end, carrying the lug 9, is bentslightly out of planewith the body of the washer. as clearly illustrated in Fig. 3 of thedrawings. As will be seen, the thickness of the washer is increased onlyat the points where'the lugs and 9 are located, so that said lugsproject slightly beyond what would form the normal thickness or planesof the the washer at this point. Hence, it will -be understood that,under pressure, the washer, including the lugs, maybe passed intoractically the same plane .as the body of the washer, there being only.a sufficient projection of the lugs to retain a co-'acting relationshipwith the abrupt walls of the'notches to prevent unlocking the nuts.The'front faces of the lugs are of substantisl width so as' to provide asurface which will not be readily bent or become worn, and which willafford suffieient support to prevent being snapped off under pressure.

lnassenibling the parts, the nut 5'is first screwed tight and then thewasher is placed in position with thelug 7' located'in the notch 6. Thenut 10 is then'run up `on the reduced screw-threaded end'until contactis made with the` front extended face of the lug 9.v Furthe'r move'rnentof the nut is then hadagainst the spring'actio'n of the'washer,

'the lng riding onthe face of the nut 10 duropposing faces of ing'suchmovement, excepting when a notch is reached When it passes into thenotch and is again carried out Over the beveled wall 12 thereof. Thismoveinent is continued until v5 the desired spring tension is obtained,'Whereupon the lug is allowed to remain in the notch, or if additionaltension is desired, the lug may be allowed to rest on the face of thenut., While such latte -osition does not prevent val movenient of tletrlifut 10 vto un- .screW the nut, such movernnt'is limited by thepresence of the succeeding notch Il located in the relative path ofmovement of the lug 9, the assage of the lug Within the notch effectualy preventing a further. un-

screwing moveinent by reason of the lug passing into contact With theabrupt face of 0 the notch. To remove the nut entirely it is required toeniploy some tool which Will release the lug 9 from theI notch.

vWhat I claim and desire to secure ,ters Patent, is

` The combination With a bolt having a screw threaded portion of-twodifferent diameters, the threads upon that portion of smaller diameterextending in an opposite by Letameter an direotion With respect to thethreads of that portion of larger diameter, -of a main nut mounted iponthat portion of larger di having its outer face formed With a radiallyextending notch, a follower nut .mounted upon that portion of smallerdialneter and overlapping the portion of larger diameter, said followernut having its inner face formed With a pair of notches, and

a split washer having its terrninals provided With rectangular lugsextending in an opposite direction With respect to each other, one

of said lugs adapted to engage in the notoh i of the main nut and theother of said lugs adapted to engage in one of the notohes of thefollower nut, each of the terminals of said Washer being reduced Wherebythe reduce'd portions of said Wash er Will normally contact f Withv thefaces of the nut.

In testirnony whereof I affix my signature in the presence of twoWitnesses.

RALPH H. FISHER t i VVitnesses MAX H. SRoLoVITz, A. TRIGG.

